Cache Maven distribution downloaded by Maven Wrapper

Closes actions#448

Author: yeikel

Diff for: src/cache.ts

@@ -23,9 +23,12 @@ interface PackageManager {
 const supportedPackageManager: PackageManager[] = [
   {
     id: 'maven',
-    path: [join(os.homedir(), '.m2', 'repository')],
+    path: [join(os.homedir(), '.m2', 'repository'),join(os.homedir(), '.mvn', 'wrapper')],
     // https://github.com/actions/cache/blob/0638051e9af2c23d10bb70fa9beffcad6cff9ce3/examples.md#java---maven
-    pattern: ['**/pom.xml']
+    pattern: [
+      '**/pom.xml',
+      '**/*.mvn*',
+    ]
   },
   {
     id: 'gradle',